Note: On Guard is no longer under development and the developer provides no support for it.On Guard is desktop security for Mac computers. It adds protection to the Mac Finder and other software to prevent users from moving, trashing, or renaming files; using control panels or the Chooser; or accessing files in certain folders. Its protection involves requiring users to enter a name and password before they can perform any actions that could change data on the computer. The free trial software works on an unlimited number of computers for 30 days after installation. At the end of the 30-day period, On Guard will be automatically disabled.